Anvil for bit dressing hammers



April 24. 1928.

C. H. BERGQUIST ANVIL FOR BIT DRESSING HAMMERS Filed Feb. 23. 1925 I INVENTOR C/Earles ..BY

A. ORNEY Patented Apr. 24, 1928.

(IFHJ J:

CHARLES H. BERGQUIST, or oneness; OKLAHOMA; Assisi Ton or ON -narrno I Bunny A. nocxs, orient/roman,""oxmnoma.

' 'ANVIL' mm BIT mmssmdnnnnnns.

Application filed February. 23, 1926. Serial No; come;

This inventionrrelates to a-nvils especially, adapted for use inconnection witliidressingi the; bits employed. tions.

inwell drilling opera- Briefiy stated an. important. object of the inventionisto provide simple: means whereby a bit' dressing hammenmay be detachably anchored to an anvil in operativerelation to av bit mounted upon the anvilto ex.-; pedite the operation of dressing the bits and. to relieve the operator sorfarxas pos: sible.

Another object isto' provi'dean anvil in whichthe parts which are subyect to unusual. wear andstrammayrbe oi a hlgh grade steel or other material whilenthe body of the anvil may be of a" cheaper'materialythenhlgh grade materialsbeing: readily renewable by.

reason of their detachable connectionywith' the body of the anvilli Other objects andadv'antages will be ap parent during the course of the following description." v

In the accompanying drawing forming a part of this application: andwinwhich like numerals are employed to designate" likepartsthroughout the'same,

Figure 1 is an end elevation of the 1111- proved anvil in use;

Figure 2 is a group perspective of the anvil, U

Figure?) is a horizontal section illustrating a slight modification of the inventlon. In the drawing the numeral 5 designates the base of an anvil while the numerals 6 designate the pillars upon which an elongated head 7 is mounted, the connection between all of these parts being, of course, rigid. Figure 1 illustrates that a bit 10 is adapted to be mounted upon the head 7 and is held in place by stop members 11, the shanks or attaching portions of which are selectively received in transverse openings 12 in the head. It will be readily seen that head of the anvil will hold the bit against lateral movement while being subjected to the blows from a bit dressing hammer 14.

In carrying out the invention the inner sides of the stop membersll may have their upper portions curved outwardly to form a more or less gradually restricted entrance opening to the space between the stop members. Figure 2 plainly illustrates that each stop member 11 is extended in a substantial distance laterally of the associated shank and flatly engagesthe top'of the head 7 to eifectively brace the stop memberl In other words, each stop member is provided at the outer side .thereof with c a heel which rests flatlyuponthei heado't' the. anvil to enable thestophaember tozwithstandthe strain to whiclrthelsajme issubjected. I .sPartieulai" attention is directed to the fact that the openings 12directly above the pillarsfiware providedwith transverse passages for the di'schargeof dirt, scale' fetc, which drops into t-heiopenings above. the pillaws and which would otherwise .clogwthe same-andtherebyprevent the: secure con-- nection of the stop members 11 to the anvil. "As; more fully illustratedin my co-pendving,application Serial Number 53,636, filed August 31, 1925, the bit dressing hammer shown generally :at 14 isprovided with an anchoringhook 20, the bill 21 of which is adapted to .be selectivelyl engaged with one of a seriesof U-shaped loops22 carried by a Urshaped attaching memberv 23. Atthis pointflitimightwbe stated that the bill 21 is selectively. engaged with one of the loops 22 fitoproperly position: the bit. dressing hammer with respect to the bit and at the same time permit of a limited manual adjustment ofthe hammer. By changing the position of the hook 21 the hammer may be moved laterally. for positioning the striking element of the hammer in operative relation to a particular portion of the face of the bit to be dressed.

Asshown in Figure 2, the outer sides of the anvil pillars 6 maybe formed with sockets or recesses 26 to snugly receive shoulders 28 on the inner sides of the ,U-shaped member 23 and the terminals of the u-shaped member are provided withopenings to receive fastening bolts 29 by means of which the U-shaped member may be firmly though detachably connectedto the'anvil. The p1l-. lars 6 may be providedwith openings for the reception of the bolts 29. i

In carrying out the invention the lugs 28 may be extended below the U-shaped member 23 and the inner faces of the same curved to correspond to the curvature of the adjacent portions of the anvil I pillars.

Particular attention is directed to the fact that the loops and consequently the bill are positioned substantially below the head of.

the anvil so that the book 20 may beeither engaged with or disengaged from any one of the loops without disturbing the bit. More specifically, there is ample space between the loops and the bit as shown in Figure l to allow for the passage of the bill of the hook. Also, the connection between the anchoring hook Q0 and any one of the loops 22 forms a swivel or practically a universal joint between the hammer and the anvil by means of which the hammer may be moved to a number of positions without breaking the connection between the hammer and the anvil. I

Figure 3 illustrates that the apertured terminals of the member 23 may be extended beyond the anvil pillars 6 for the reception of a single bolt 69 by means of which the member 23 is firmly attached to the anvil.

The U-shaped member 23 may be of a high grade steel such as electric steel and is therefore capable of withstanding the severe strainincident to use. The striking element of the bit dressing hammer has a trip hammer action which results in strain on the loops and the bill and in case wear takes place the U-shaped member with the loops may be renewed without the exercise of unusual skill and without discarding the body of the anvil.

The foregoing illustrates that the invention is capable of a variety of mechanical expressions and it is therefore to be understood that the forms of invention herewith shown and described are to be taken merely as preferred examples of the same and that such minor changes in arrangement and construction of parts may be made as will remain within the spirit of the invention and the scope of what is claimed.

Having thus described the invention, what is claimed is:

1 An anvil comprising a body having a head provided with openings extending therethrough, and stop members having shanks received in said openings, the opposed inner sides of the stop members being inclined outwardly to form a vertical graduallyrestricted entrance opening to the space between the stop members, said stop members being provided with laterally projecting heels on the outer sides thereof to engage the adjacent portion of the anvil to brace the stop members against lateral pressure and to limit the entrance of the shanks into said openings.

2. In a bit dressing accessory, the combination of an anvil having spaced pillars and a headon the pollars, a U-shaped member embracing the pillars and having sides extended beyond the pillars and apertured, a fastening bolt extending through the apertures in the extended portions of said sides, the corners ofsaid. U-shaped membernnd said pillars being provided with interfitting protuberances and recesses cooperating with said bolt in securely holding the U-shapcd member in place, said U-shapedmember beingprovided with eyes a substantial distance below the top of the anvil and the bit mounted thereon thereby defining a space for the free movement. of the attaching hook oi a bit dressing hammer.

In testimony whereof I afiix my signature.

CHARLES H. BERGQUIST. 

